Which one of the following best describes the purpose of the Communications Plan?

This describes the function of an Architecture Repository, which stores architectural artifacts, not the purpose of a Communications Plan.

While a Communications Plan generally ensures information reaches stakeholders, its specific emphasis in TOGAF's governance context is on compliance assessment results for the Architecture Board, making C more precise.

In TOGAF's Phase G (Implementation Governance), the Communications Plan has a specific purpose to detail how architectural information, especially the outcomes of Architecture Compliance assessments, is distributed. It explicitly ensures these results reach the Architecture Board, enabling them to make informed decisions regarding architectural adherence and necessary interventions.

Informing the Architecture Board of changes is a broader aspect of governance, but the Communications Plan specifically targets compliance assessment results as a primary communication focus.

Showing progression of change is typically handled by architecture roadmaps or transition architectures, not directly by the Communications Plan itself.